Primarius Thorwald Baumgartner lies shot in his castle garden - next to him a historical flintlock pistol. Did Primarius Baumgartner really duel the morning after his birthday party? For Major Steinkellner, the case seems quickly solved: a schizophrenic patient is arrested. But journalist Ernesto Valenti has doubts. What begins as a bizarre murder case reveals dark entanglements - doctors who go over corpses for their careers, jealousy and greed - and an old debt from the time of Nazi euthanasia. The closer Ernesto gets to the truth, the more dangerous it becomes for him.